Anxiety:
Sudden sound is an urgent wake-up call that alerts and activates the stress response – a biological alarm that affects the brain in powerful ways.
Because loud noise often heralds bad news, animals and humans have evolved a rapid response to audio stressors: the roar of a carnivore, the crack of a falling tree, the scream of a child. More recently: the explosion of a weapon, the wail of a siren, the crash of the stock market.
http://www.fi.edu/learn/brain/stress.html
alarm clock sound: http://www.freesound.org/download/34853/34853_jackstrebor_Alarm_Clock.aif
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